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Sailboat Specifications

Tempest 31 Westerly

Designed by Ed Dubois · Built by Westerly Yachts Ltd. (Uk) · First built 1987

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About the Tempest 31 Westerly

Designed by renowned naval architect Ed Dubois and built by Westerly Yachts between 1987 and 1993, this 30-foot sailboat represents a compelling blend of performance and practicality. With 107 hulls produced during its six-year production run, the Tempest 31 gained recognition as a capable coastal cruiser with respectable sailing characteristics. The fin keel and spade rudder configuration, combined with a masthead sloop rig carrying 400 square feet of sail area, delivers responsive handling and good upwind performance. At 9,019 pounds with 2,690 pounds of ballast, the boat strikes a reasonable balance between stability and speed, achieving a theoretical hull speed of 6.63 knots. The moderate displacement and sail-area-to-displacement ratio of 14.82 suggest lively performance in light to moderate conditions. Built with fiberglass construction typical of Westerly's solid reputation for seaworthiness, the Tempest 31 suits coastal cruising and weekend sailing admirably. The comfort ratio of 22.17 indicates relatively quick motion in a seaway, while the capsize screening formula of 2.08 suggests reasonable stability for offshore ventures in experienced hands. This boat appeals to sailors seeking Ed Dubois design pedigree in an accessible, well-built package ideal for exploring coastal waters with occasional offshore capability.

Core Dimensions
LOA (Length Overall) 30.58 ft / 9.32 m
LWL (Waterline Length) 24.50 ft / 7.47 m
Beam 10.83 ft / 3.30 m
Max Draft 5.00 ft / 1.52 m
Displacement 9,019.00 lb / 4,091 kg
Ballast 2,690.00 lb / 1,220 kg
Sail Area (Reported) 400.00 ft² / 37.16 m²
Design & Construction
Hull Type Fin w/spade rudder
Rigging Type Masthead Sloop
Construction FG
Designer Ed Dubois
Builder Westerly Yachts Ltd. (UK)
First Built 1987
Last Built 1993
Number Built 107
Associations Westerly Owners Association
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